Product-configurable sparse ext images.

Change-Id: Ifd0ac14d7df331c9f6f1e3eee0722e07b4ab199a
diff --git a/core/config.mk b/core/config.mk
index 5805607..7cd6fae 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -214,7 +214,7 @@
 FS_GET_STATS := $(HOST_OUT_EXECUTABLES)/fs_get_stats$(HOST_EXECUTABLE_SUFFIX)
 MKEXT2IMG := $(HOST_OUT_EXECUTABLES)/genext2fs$(HOST_EXECUTABLE_SUFFIX)
 MAKE_EXT4FS := $(HOST_OUT_EXECUTABLES)/make_ext4fs$(HOST_EXECUTABLE_SUFFIX)
-MKEXT2USERIMG := $(HOST_OUT_EXECUTABLES)/mkuserimg.sh
+MKEXTUSERIMG := $(HOST_OUT_EXECUTABLES)/mkuserimg.sh
 MKEXT2BOOTIMG := external/genext2fs/mkbootimg_ext2.sh
 MKTARBALL := build/tools/mktarball.sh
 TUNE2FS := $(HOST_OUT_EXECUTABLES)/tune2fs$(HOST_EXECUTABLE_SUFFIX)